It's the anti-sway bar endlinks. My '06 g35x has the same symptoms - clunking at low speeds, varying from which side of the car the noise comes from as to which side of the car is hitting bumps in the road surface. EASY to replace yourself with the front end on jack stand, and you don't even need to remove the underbody plastic panel, so it's quicker than an oil change. To verify this is the problem before you order the parts (which are about $100 for the x, as it's a different part altogether than the endlinks on the RWD sedans or coupes, so be careful when ordering), just remove the current endlinks and take a test drive - don't worry about removing the whole sway bar, just the links at the ends of the bar). If this is the case, you will not hear the clunking any more. I do not recommend driving like this for any distance, as the car will become tail happy and your sway bar ends could point towards the ground while left unsupported and become damaged.
There was a known issue with these cars involving worn bushings on the compression rod mounting, item 10
http://www.scribd.com/doc/68852362/2006-Infiniti-G35-Front-Suspension
Try this first
http://trueler.com/2010/09/09/infiniti-g35-compression-rod-problems-noise-front-suspension/
Then suspect the front struts needing replacement, as the mileage is about right for that
SOURCE: When my 2005 Infiniti G35x
One of the front wheels isn't balanced correctly and its vibrations cause a resonance in the suspension at that speeds.
You might also have a look at the shocks - if you have fitted new tires their hardness and misbalance might bring out the weaknesses in the shocks : these vibrations might be the first sign the shocks have aged and will soon have to be replaced.
You just need to have all the wheels balanced and the bushings of the suspension inspected at a tyre shop - a 30 minute/$50 simple job.
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